Resource Production & Management: These Perks will benefit your Resource Production in various ways, such as giving Production Boosts or reducing your Army Upkeep;

Battles & Unit Stats: These Perks will either directly impact the outcome of a Battle or give you extra rewards for winning them, such as improving the Statistics of your Units or increasing the Experience you get from Battles;

Bases & Training: These will improve your Base building and Unit training actions, whether by reducing the cost of Units or decreasing the amount of time a Base takes to upgrade.